Yes, you can. You will need to estimate your tax and your withholding to determine if you will owe any tax. Do what you can here.
If you end up getting a refund, then no one will care what you estimated.
If you end up owing tax when you file, then you will owe interest from the original due date (April 18, 2017) to the date you file.
There is a penalty for not
filing on time, so filing an extension is a smart thing if you simply can't make it by April 18th.
However, there is interest and possible penalties for not
paying on time, so do the return as soon as you can, in case you owe money.
